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require_relative '../../../spec_helper'
describe "IO::Buffer#free" do
context "with a buffer created with .new" do
it "frees internal memory and nullifies the buffer" do
buffer = IO::Buffer.new(4)
buffer.free
buffer.null?.should be_true
end
it "frees mapped memory and nullifies the buffer" do
buffer = IO::Buffer.new(4, IO::Buffer::MAPPED)
buffer.free
buffer.null?.should be_true
end
end
context "with a file-backed buffer created with .map" do
it "frees mapped memory and nullifies the buffer" do
File.open(__FILE__, "r") do |file|
buffer = IO::Buffer.map(file, nil, 0, IO::Buffer::READONLY)
buffer.free
buffer.null?.should be_true
end
end
end
context "with a String-backed buffer created with .for" do
context "without a block" do
it "disassociates the buffer from the string and nullifies the buffer" do
string = +"test"
buffer = IO::Buffer.for(string)
# Read-only buffer, can't modify the string.
buffer.free
buffer.null?.should be_true
end
end
context "with a block" do
it "disassociates the buffer from the string and nullifies the buffer" do
string = +"test"
IO::Buffer.for(string) do |buffer|
buffer.set_string("meat")
buffer.free
buffer.null?.should be_true
end
string.should == "meat"
end
end
end
ruby_version_is "3.3" do
context "with a String-backed buffer created with .string" do
it "disassociates the buffer from the string and nullifies the buffer" do
string =
IO::Buffer.string(4) do |buffer|
buffer.set_string("meat")
buffer.free
buffer.null?.should be_true
end
string.should == "meat"
end
end
end
it "can be called repeatedly without an error" do
buffer = IO::Buffer.new(4)
buffer.free
buffer.null?.should be_true
buffer.free
buffer.null?.should be_true
end
it "is disallowed while locked, raising IO::Buffer::LockedError" do
buffer = IO::Buffer.new(4)
buffer.locked do
-> { buffer.free }.should raise_error(IO::Buffer::LockedError, "Buffer is locked!")
end
buffer.free
buffer.null?.should be_true
end
context "with a slice of a buffer" do
it "nullifies the slice, not touching the buffer" do
buffer = IO::Buffer.new(4)
slice = buffer.slice(0, 2)
slice.free
slice.null?.should be_true
buffer.null?.should be_false
buffer.free
end
it "nullifies buffer, invalidating the slice" do
buffer = IO::Buffer.new(4)
slice = buffer.slice(0, 2)
buffer.free
slice.null?.should be_false
slice.valid?.should be_false
end
end
end
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